An assembly of electronic devices designed for the internal visualization and examination of sections of the gastrointestinal (GI) tract using a non-digestible video capsule after it has been swallowed by a patient. The system typically consists of an operator workstation, various types of video capsules, an external sensor device that receives the wireless signals from the capsule, and a data recorder. As the capsule passes through the GI tract, video images of it sections (e.g., oesophagus, small bowel and colon) are relayed to the operator for examination and data recording; the capsule is egested from the gut.